<?php
    $num=1;
    for($i=1;$i<10;$i++){
        $num=($num+1)*2;
    }
    echo $num;
?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
</html>

